What is the most you've ever paid for a disc?

So, tonight as I watch Biggest Loser and play on the laptop, I am doing my nightly search on Ebay for discs and I see a guy selling an Innova CE Firebird for over a hundred dollars...wow! Is this a realistic price for a disc...one you would throw, collect, etc.?

I have paid 25-30 for a few discs, most of them to support current pro players tours...but, my average disc buy is 17.95.